B-31

1973 — 1988
Designer
Bruno Boström
Builders
?
Associations
?
# Built
1000
Hull Type
Fin with rudder on skeg
Construction
FG

Dimensions

Length Overall
30 7 / 9.3 m
Waterline Length
25 11 / 7.9 m
Beam
9 0 / 2.8 m
Draft
5 10 / 1.8 m
Displacement
7,780 lbs / 3,530 kg
Ballast
3,750 lbs / 1,700 kg (Iron)

Rig and Sails

Type
Masthead Sloop
Reported Sail Area
370 ft2 / 34.4 m2
Total Sail Area
370.3 ft2 / 34.4 m2
Mainsail
Sail Area
146.2 ft2 / 13.6 m2
P
31 9 / 9.7 m
E
9 2 / 2.8 m
Mast Height
?
Foresail
Sail Area
224 ft2 / 20.8 m2
I
37 4 / 11.4 m
J
11 11 / 3.7 m
Forestay Length
39 3 / 12 m

Auxilary Power

Make
Yanmar
Model
?
HP
8
Fuel Type
Diesel
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
6.83 knots
Sail Area/Displacement
15.08
under powered
Ballast/Displacement
48.16
stiffer, more powerful
Displacement/Length
198.12
light
Comfort Ratio
23.17
coastal cruiser
Capsize Screening
1.83
better suited for ocean passages

Notes

Derived from the earlier Bostrum designed MARKAT 30. Also known as BOSTRUM 31. Most were sold as bare hulls or kits.


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